Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
declare(strict_types=1);
namespace Friendica\Core\Logger\Handler;
use Psr\Log\LoggerInterface;
use Psr\Log\LogLevel;
use Throwable;
/**
* A facility to enable logging of runtime errors, exceptions and fatal errors.
*
* Quick setup: <code>ErrorHandler::register($logger);</code>
*/
class ErrorHandler
{
/** @var LoggerInterface */
private $logger;
/** @var ?callable */
private $previousExceptionHandler = null;
/** @var array<class-string, LogLevel::*> an array of class name to LogLevel::* constant mapping */
private $uncaughtExceptionLevelMap = [];
/** @var callable|true|null */
private $previousErrorHandler = null;
/** @var array<int, LogLevel::*> an array of E_* constant to LogLevel::* constant mapping */
private $errorLevelMap = [];
/** @var bool */
private $handleOnlyReportedErrors = true;
/** @var bool */
private $hasFatalErrorHandler = false;
/** @var LogLevel::* */
private $fatalLevel = LogLevel::ALERT;
/** @var ?string */
private $reservedMemory = null;
/** @var ?mixed */
private $lastFatalTrace;
/** @var int[] */
private static $fatalErrors = [E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR, E_USER_ERROR];
public function __construct(LoggerInterface $logger)
{
$this->logger = $logger;
}
/**
* Registers a new ErrorHandler for a given Logger
*
* By default it will handle errors, exceptions and fatal errors
*
* @param LoggerInterface $logger
* @param array<int, LogLevel::*>|false $errorLevelMap an array of E_* constant to LogLevel::* constant mapping, or false to disable error handling
* @param array<class-string, LogLevel::*>|false $exceptionLevelMap an array of class name to LogLevel::* constant mapping, or false to disable exception handling
* @param LogLevel::*|null|false $fatalLevel a LogLevel::* constant, null to use the default LogLevel::ALERT or false to disable fatal error handling
*
* @return ErrorHandler
*/
public static function register(LoggerInterface $logger, $errorLevelMap = [], $exceptionLevelMap = [], $fatalLevel = null): self
{
/** @phpstan-ignore-next-line */
$handler = new static($logger);
if ($errorLevelMap !== false) {
$handler->registerErrorHandler($errorLevelMap);
}
if ($exceptionLevelMap !== false) {
$handler->registerExceptionHandler($exceptionLevelMap);
}
if ($fatalLevel !== false) {
$handler->registerFatalHandler($fatalLevel);
}
return $handler;
}
/**
* Stringify the class of the given object for logging purpose
*
* @param object $object An object to retrieve the class
*
* @return string the classname of the object
*/
public static function getClass(object $object): string
{
$class = \get_class($object);
if (false === ($pos = \strpos($class, "@anonymous\0"))) {
return $class;
}
if (false === ($parent = \get_parent_class($class))) {
return \substr($class, 0, $pos + 10);
}
return $parent . '@anonymous';
}
/**
* @param array<class-string, LogLevel::*> $levelMap an array of class name to LogLevel::* constant mapping
* @param bool $callPrevious Set to true, if a previously defined exception handler should be called after handling this exception
*
* @return $this
*/
public function registerExceptionHandler(array $levelMap = [], bool $callPrevious = true): self
{
$prev = set_exception_handler(function (Throwable $e): void {
$this->handleException($e);
});
$this->uncaughtExceptionLevelMap = $levelMap;
foreach ($this->defaultExceptionLevelMap() as $class => $level) {
if (!isset($this->uncaughtExceptionLevelMap[$class])) {
$this->uncaughtExceptionLevelMap[$class] = $level;
}
}
if ($callPrevious && $prev) {
$this->previousExceptionHandler = $prev;
}
return $this;
}
/**
* @param array<int, LogLevel::*> $levelMap an array of E_* constant to LogLevel::* constant mapping
* @param bool $callPrevious Set to true, if a previously defined exception handler should be called after handling this exception
* @param int $errorTypes a Mask for masking the errortypes, which should be handled by this error handler
* @param bool $handleOnlyReportedErrors Set to true, only errors set per error_reporting() will be logged
*
* @return $this
*/
public function registerErrorHandler(array $levelMap = [], bool $callPrevious = true, int $errorTypes = -1, bool $handleOnlyReportedErrors = true): self
{
$prev = set_error_handler([$this, 'handleError'], $errorTypes);
$this->errorLevelMap = array_replace($this->defaultErrorLevelMap(), $levelMap);
if ($callPrevious) {
$this->previousErrorHandler = $prev ?: true;
} else {
$this->previousErrorHandler = null;
}
$this->handleOnlyReportedErrors = $handleOnlyReportedErrors;
return $this;
}
/**
* @param LogLevel::*|null $level a LogLevel::* constant, null to use the default LogLevel::ALERT
* @param int $reservedMemorySize Amount of KBs to reserve in memory so that it can be freed when handling fatal errors giving Monolog some room in memory to get its job done
*
* @return $this
*/
public function registerFatalHandler($level = null, int $reservedMemorySize = 20): self
{
register_shutdown_function([$this, 'handleFatalError']);
$this->reservedMemory = str_repeat(' ', 1024 * $reservedMemorySize);
$this->fatalLevel = null === $level ? LogLevel::ALERT : $level;
$this->hasFatalErrorHandler = true;
return $this;
}
/**
* @return array<class-string, LogLevel::*>
*/
protected function defaultExceptionLevelMap(): array
{
return [
'ParseError' => LogLevel::CRITICAL,
'Throwable' => LogLevel::ERROR,
];
}
/**
* @return array<int, LogLevel::*>
*/
protected function defaultErrorLevelMap(): array
{
return [
E_ERROR => LogLevel::CRITICAL,
E_WARNING => LogLevel::WARNING,
E_PARSE => LogLevel::ALERT,
E_NOTICE => LogLevel::NOTICE,
E_CORE_ERROR => LogLevel::CRITICAL,
E_CORE_WARNING => LogLevel::WARNING,
E_COMPILE_ERROR => LogLevel::ALERT,
E_COMPILE_WARNING => LogLevel::WARNING,
E_USER_ERROR => LogLevel::ERROR,
E_USER_WARNING => LogLevel::WARNING,
E_USER_NOTICE => LogLevel::NOTICE,
E_STRICT => LogLevel::NOTICE,
E_RECOVERABLE_ERROR => LogLevel::ERROR,
E_DEPRECATED => LogLevel::NOTICE,
E_USER_DEPRECATED => LogLevel::NOTICE,
];
}
/**
* The Exception handler
*
* @param Throwable $e The Exception to handle
*/
private function handleException(Throwable $e): void
{
$level = LogLevel::ERROR;
foreach ($this->uncaughtExceptionLevelMap as $class => $candidate) {
if ($e instanceof $class) {
$level = $candidate;
break;
}
}
$this->logger->log(
$level,
sprintf('Uncaught Exception %s: "%s" at %s line %s', self::getClass($e), $e->getMessage(), $e->getFile(), $e->getLine()),
['exception' => $e]
);
if ($this->previousExceptionHandler) {
($this->previousExceptionHandler)($e);
}
if (!headers_sent() && !ini_get('display_errors')) {
http_response_code(500);
}
exit(255);
}
/**
* The Error handler
*
* @private
*
* @param int $code The PHP error code
* @param string $message The error message
* @param string $file If possible, set the file at which the failure occurred
* @param int $line
* @param array|null $context If possible, add a context to the error for better analysis
*
* @return bool
*/
public function handleError(int $code, string $message, string $file = '', int $line = 0, ?array $context = []): bool
{
if ($this->handleOnlyReportedErrors && !(error_reporting() & $code)) {
return false;
}
// fatal error codes are ignored if a fatal error handler is present as well to avoid duplicate log entries
if (!$this->hasFatalErrorHandler || !in_array($code, self::$fatalErrors, true)) {
$level = $this->errorLevelMap[$code] ?? LogLevel::CRITICAL;
$this->logger->log($level, self::codeToString($code).': '.$message, ['code' => $code, 'message' => $message, 'file' => $file, 'line' => $line]);
} else {
$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
array_shift($trace); // Exclude handleError from trace
$this->lastFatalTrace = $trace;
}
if ($this->previousErrorHandler === true) {
return false;
} elseif ($this->previousErrorHandler) {
return (bool) ($this->previousErrorHandler)($code, $message, $file, $line, $context);
}
return true;
}
/**
* @private
*/
public function handleFatalError(): void
{
$this->reservedMemory = '';
$lastError = error_get_last();
if ($lastError && in_array($lastError['type'], self::$fatalErrors, true)) {
$this->logger->log(
$this->fatalLevel,
'Fatal Error ('.self::codeToString($lastError['type']).'): '.$lastError['message'],
['code' => $lastError['type'], 'message' => $lastError['message'], 'file' => $lastError['file'], 'line' => $lastError['line'], 'trace' => $this->lastFatalTrace]
);
}
}
/**
* @param mixed $code
*
* @return string
*/
private static function codeToString($code): string
{
switch ($code) {
case E_ERROR:
return 'E_ERROR';
case E_WARNING:
return 'E_WARNING';
case E_PARSE:
return 'E_PARSE';
case E_NOTICE:
return 'E_NOTICE';
case E_CORE_ERROR:
return 'E_CORE_ERROR';
case E_CORE_WARNING:
return 'E_CORE_WARNING';
case E_COMPILE_ERROR:
return 'E_COMPILE_ERROR';
case E_COMPILE_WARNING:
return 'E_COMPILE_WARNING';
case E_USER_ERROR:
return 'E_USER_ERROR';
case E_USER_WARNING:
return 'E_USER_WARNING';
case E_USER_NOTICE:
return 'E_USER_NOTICE';
case E_STRICT:
return 'E_STRICT';
case E_RECOVERABLE_ERROR:
return 'E_RECOVERABLE_ERROR';
case E_DEPRECATED:
return 'E_DEPRECATED';
case E_USER_DEPRECATED:
return 'E_USER_DEPRECATED';
}
return 'Unknown PHP error';
}
}